<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        .father{
            overflow: hidden;
            width: 300px;
            height: 300px;
            margin: 100px auto;
            background-color: pink;
            text-align: center;
        }
        .son {
            width: 200px;
            height: 200px;
            margin: 50px;
            background-color: purple;
            line-height: 200px;
            color: #fff;
        }
    </style>
</head>

<body>
   <div class="father">
    <div class="son">son儿子</div>
   </div> 
   <script>
    //常见事件对象的属性和方法
    //阻止冒泡 dom 推荐的标准 stopPropagation()
    var son = document.querySelector('.son');
    son.addEventListener('click',function(e){
        alert('son');
        e.stopPropagation();//stop停止 Propagation传播
        e.cancelBubble = true;//非标准 cancel取消 bubble 泡泡
    },false);
    var father = document.querySelector('.father');
    father.addEventListener('click',function(){
        alert('father');
    },false);
    document.addEventListener('click',function(){
        alert('document');
    })

   </script>
</body>
</html>